And as they drifter up their minds sang with the ecstatic knowledge that either what they were doing was completely and utterly and totally impossible or that physics had a lot of catching up to do. Physics shook its head and, looking the other way, concentrated on keeping the cards going along the Euston Road and out over towards the Westway flyover, on keeping the street lights lit and on making sure that when somebody on Baker Street dropped a cheeseburger it went splat on the ground.